Belt has squeaking sound, usually on behalf of the belt surface friction coefficient is reduced greatly, have excessive wear. If the noise in the vehicle load, observe one of driving belt, you'll find out automatic belt tightening device or the tension of the belt wheel resistance or elastic abnormal increase.

Most automatic belt tensioner and tensioner at the bottom between the arms, somewhere along the slide direction of the length of a belt wear indicator. The flag by the pointer and two to three labeled components, which marked the belt tensioner operating range. If the pointer is outside this range, then the belt is probably stretched too long and should be replaced. In the automatic belt tensioner is not installed in the car, in the middle of two pulleys with a belt elongation of the standard measurement scale for measurement. If there are differences with the standard value, it is best to replace the belt.

If the drive belt elongation level did not exceed its limits, so if your car is an automatic tensioner installed, then you should focus on looking at it. First, start the engine, auxiliary drive configuration as much as possible to increase the load, and then observe the belt tensioner arm; while working in the engine, belt tensioner hanging tube should have a small amount of displacement. If the belt tensioner arm does not move, turn off the engine, the belt tensioner hanging tubes within the labor movement working stroke it, there are about 0.6 centimeters of displacement. If the belt tensioner arm can not move, it indicates that the belt tensioner failure, and should be replaced; belt tensioner if the amount of displacement of the cantilever over 0.6 centimeters, indicating the spring load is too small to cause the belt to slip, and then measure again if you still Thus, only replace the belt tensioner.

If the belt is not over stretched, and automatic slack adjuster in good operation, then have a look whether the work surface of the belt grinding is as smooth as a mirror. This is typically caused by belt worn in the slip load, the best proof paint is slipping belt wheel surface shedding.

If the belt squeaky often occurred in the wet weather, and a belt and a belt wheel surface is relatively smooth. We do the same test: let the configuration in the system under load, at the same time to belt sprinkler, if there is noise, replace the belt.

Long scream or shrill noise:
Although the belt pulley with the belt surface due to reverse sand, dirt or use the installation will also cause the belt squeal or harsh noise, but often is caused by improper auxiliary device assembly.

If the noise occurs in a car traveling soon, and it may be caused by the poor quality of the original installation. Check that you think might lead to failure of the concept phase components. If the noise occurs in an old car, then you should consider the auxiliary drive some of the relevant parts are thoroughly replaced. Careful observation may have been fine replacement of parts to see if they are firmly mounting bracket pulley assembly may also cause misalignment.

The above mentioned are stained with dirt or sand between the belt and pulley can lead to the noise, so if the car used in the dirty environment, check the surface all pulleys are dirt.

Take the timing gear belt for installation candidate should be adjusted immediately. This is why the timing gear belt to indicate the direction of rotation causes. If for other maintenance work to remove the timing gear belt and then install the anti-fashion, when the belt is running you will hear a sharp, piercing shriek. Try to install the belt direction reversed, to see if the fault disappears.